Demi Lovato heads to dinner as she leaves rehab after celebrating three months of sobriety

Her mom recently spoke of her pride at her famous daughter reaching 90 days of sobriety.

And on Saturday night Demi Lovato, 26, was seen out of rehab for the first time since she entered treatment three months ago, after achieving the milestone.

The troubled singer, who was hospitalised after an overdose in July, was spotted out for dinner with a handsome male pal at Matsuhisa restaurant in Beverly Hills, in photos published by TMZ on Sunday.

Clean and sober: Demi Lovato, 26, was back out and about on Saturday night (pictured May)

The celebrity website reports that Demi looked clean, sober and 'generally great', and that her gentleman companion was clothing designer, Henry Levy. He founded the label Enfants Riches Deprimes in 2012 and uses the professional name Henri Alexander.

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She reportedly had a great time with the designer at the flashy sushi eaterie, and was 'happy, smiling and laughing through dinner,' as well as holding hands with him, according to their source.

Henry has spoken previously about his own battles with drugs which resulted in multiple stints in rehab.

He told Complex in 2016: 'I was, like, a f*** up in high school. I was caught up in drugs and s**t like that,' and did his first stint in rehab at 15, at Visions Adolescent Treatment, a Malibu facility for underage addicts.

Back out: The troubled singer, who was hospitalised after an overdose in July, was spotted out for dinner at Matsuhisa restaurant in Beverly Hills, reports TMZ on Sunday (pictured May)

On July 24, Paramedics were called to the former Disney star's $8.3million four-bedroom Hollywood Hills mansion and are believed to have revived an 'unconscious' Demi with the opiate antidote Narcan.

Her mom Dianna De La Garza told Maria Menounos' Sirius XM show last month that Demi was doing well in her rehab treatment, now sober for 90 days.

She said: 'She has 90 days and I couldn't be more thankful or more proud of her because addiction being a disease is work. It's very hard and there are no short cuts.'

Dianna previously admitted she was still 'shaken' by the former X Factor judge's overdose, but said her daughter is now 'happy' and 'healthy' as she works toward her sobriety.

She explained: 'It's still a really difficult thing to talk about. I literally start to shake a little bit when I start to remember what happened that day. [Demi's assistant called and] said, 'Demi overdosed'. So, I was in shock. I didn't know what to say. It was just something that I never, ever expected to hear, as a parent, about any of my kids.

Close shave: Demi (pictured in June 24 in Lisbon, Portugal) was hospitalised in July after an overdose

I just feel like the reason she's alive today is because of the millions of prayers that went up that day when everybody found out what was happening.

'I don't think she would be here if it hadn't been for those prayers and the good doctors and Cedars-Sinai. They were the best. I couldn't have asked for a better team of people to save her life.

'She's happy. She's healthy. She's working on her sobriety, and she's getting the help she needs. That in itself encourages me about her future and about the future of our family,' she added.